Polymer grouts for plugging lost circulation in geothermal wells.

Galbreath, D. (Green Mountain International, Waynesvile, NC) ; Mansure, Arthur James ; Bauer, Stephen J.

Sandia National Laboratories

关键词: Fractures;    Extrusion;    Polymers;    Testing Geothermal Engineering.;    Losses;   

DOI  :  10.2172/892050
RP-ID  :  SAND2004-5853
RP-ID  :  AC04-94AL85000
RP-ID  :  892050

美国|英语

来源: UNT Digital Library

【 摘 要 】

We have concluded a laboratory study to evaluate the survival potential of polymeric materials used for lost circulation plugs in geothermal wells. We learned early in the study that these materials were susceptible to hydrolysis. Through a systematic program in which many potential chemical combinations were evaluated, polymers were developed which tolerated hydrolysis for eight weeks at 500 F. The polymers also met material, handling, cost, and emplacement criteria. This screening process identified the most promising materials. A benefit of this work is that the components of the polymers developed can be mixed at the surface and pumped downhole through a single hose. Further strength testing is required to determine precisely the maximum temperature at which extrusion through fractures or voids causes failure of the lost circulation plug.